I highly recommend this paper, available here. I was unable to review it on time, in part because it is long, demanding and comprehensive, as is often the case with Ioannis’ papers. If you are unable to read this 93-page primer, many of the main points are neatly summarised in this video interview Ioannis gave at the OECD.

If you have a bit of time, I suggest you read the discussion of the various potential competition concerns raised by the blockchain from an EU law perspective in the paper’s last 25 pages or so (starting on page 65).